Display control device and display control method

ABSTRACT

A display control device for controlling a display panel is switchable between a first display mode in which a video is displayed at a first vertical resolution and a second display mode in which a video is displayed at a second vertical resolution that is lower than the first vertical resolution. The display control device comprises at least one memory and at least one processor which function as: a control unit configured, in a first case where a first operation is received in the first display mode, to change to the second display mode after changing a display update timing in the first display mode, and in a second case where a second operation is received in the second display mode, to change the display update timing after changing to the first display mode.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to a display control device and a displaycontrol method.

Description of the Related Art

An imaging device such as a digital camera is generally capable ofcontinuous imaging (continuous shooting) for acquiring static imagescontinuously. The imaging device is capable of displaying a video of acaptured object on a display device in real time (live view) whilecontinuously capturing static images of the object. To realize this,during continuous imaging, the imaging device reads two differentimages, namely an image (a display image; a video) to be displayed onthe display device and a static image (a recording image) to berecorded. The imaging device records the static image while displayingthe display image on the display device in real time. Further, to makethe time between acquisition (reading) and display of the display imageuniform, the imaging device is also capable of controlling an exposuretiming and a display update timing.

In Japanese Patent Application Publication No. 2020-57974, an imagingdevice makes intervals between the centers of gravity (centers) ofexposure operations uniform by controlling the exposure timing duringcontinuous imaging. Further, with respect to the display image, theimaging device controls the display update timing so as to make the timebetween exposure and display on the display device uniform. Thus, evenduring continuous imaging, the movement amount of the object displayedon the display device is less likely to become discontinuous. As aresult, the possibility that movement by the object on the display imagewill produce a feeling of discomfort in the user can be reduced.

Here, the timing at which the user issues an instruction to startcontinuous shooting is typically an arbitrary timing. Further, it isimportant to ensure that the time from the start of continuous shootingto acquisition of a static image is uniform regardless of the continuousshooting start timing so that when the user shoots a moving object, themoving object is captured with the intended composition. Furthermore,the time from acquisition of the display image to display thereof on thedisplay device is preferably constant for each frame.

In Japanese Patent Application Publication No. 2020-57974, however, theexposure timing and the display update timing are controlled withoutconsidering the fact that the timing at which the user issues aninstruction to start continuous shooting is arbitrary. Meanwhile, adisplay update rate (the frame rate) may be modified in response to theinstruction to start continuous shooting. Depending on the timing of theinstruction to start continuous shooting, therefore, variation may occurin the time from the instruction to start continuous shooting toacquisition of a static image or the time from acquisition of thedisplay image to display thereof on the display device due tomodification of the display update rate. As a result, a difference mayoccur between the image that the user intended to capture and the staticimage that is actually captured, making it impossible for the user toperform image capture as intended.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a technique with whicha user can perform image capture as intended, without feelingdiscomfort.

An aspect of the present invention is: a display control device forcontrolling a display panel that is switchable between a first displaymode in which a video is displayed at a first vertical resolution and asecond display mode in which a video is displayed at a second verticalresolution that is lower than the first vertical resolution, the displaycontrol device comprising at least one memory and at least one processorwhich function as: a control unit configured, in a first case where afirst operation is received in the first display mode, to change to thesecond display mode after changing a display update timing in the firstdisplay mode, and in a second case where a second operation is receivedin the second display mode, to change the display update timing afterchanging to the first display mode.

An aspect of the present invention is: a display control method forcontrolling a display panel that is switchable between a first displaymode in which a video is displayed at a. first vertical resolution and asecond display mode in which a video is displayed at a second verticalresolution that is lower than the first vertical resolution, the displaycontrol method comprising: a step for changing to the second displaymode after changing a display update timing in the first display mode ina first case where a first operation is received in the first displaymode; and a step for changing the display update timing after changingto the first display mode in a second case where a second operation isreceived in the second display mode.

Further features of the present invention will become apparent from thefollowing description of exemplary embodiments with reference to theattached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exterior view of a digital camera according to a firstembodiment.

FIG. 2 is a view showing a configuration of the digital camera accordingto the first embodiment.

FIG. 3 is a flowchart showing an operation performed during continuousimaging according to the first embodiment.

FIG. 4 is a timing chart of continuous imaging according to the firstembodiment.

FIG. 5 is a timing chart of continuous imaging according to a secondembodiment.

FIG. 6 is a flowchart showing an operation performed during continuousimaging according to the second embodiment.

DESCRIPTION OF THE EMBODIMENTS

First, display modes (display update rates and display methods) of adisplay device will be described below as basic technology.

As display update rates (frame rates) of a display device, 59.94 fps andan enhanced display update rate of 119.88 fps are generally available.Further, a “progressive method”, in which an image is displayed usingall of the scan lines, and an “interlacing method”, in which an image isdisplayed using half of the scan lines (at half the vertical resolution)are typically available as display methods used at the 119.88 fpsdisplay update rate. In the “interlacing method”, an image is displayedby alternating at high speed and at equal time intervals between displayusing the odd-numbered. lines of the display device and display usingthe even-numbered lines thereof. In so doing, a moving image can bedisplayed smoothly, and there appears to be little deterioration in theresolution.

Here, in order to fix the time from acquisition of the display image todisplay thereof on the display device in each imaging operation, thedisplay start timing may be modified to the start timing of continuousimaging. In this case, however, when the “interlacing method” is used atthe start timing of continuous imaging, the display time of either theodd-numbered. lines or the even-numbered lines becomes longer than thedisplay time of the other. As a result, flickering may occur on thedisplay device.

[First Embodiments]: A preferred embodiment of the present inventionwill be described in detail below with reference to the attachedfigures. Note that in the following embodiment, a case in which adigital camera capable of continuously shooting static images is used asthe display device will be described as an example. Note that thedisplay device is not limited to a digital camera, and a mobile terminalsuch as a smartphone, for example, may be used instead. This embodimentcan also be realized as a display control device for controlling adisplay device of this type.

<Configuration of Display Device>: FIG. 1 is a back view (an externalview) of a digital camera 200 serving as the display device (the displaycontrol device) according to this embodiment. The digital camera 200includes a display unit 220, a shutter button 224, a moving imageshooting button 230, an operating unit 226, an external recording medium229, and a lid 101.

The display unit 220 (display panel) displays images and variousinformation. The display unit 220 includes a TFT liquid crystal display(a Thin Film Transistor LCD) or the like. The display unit 220 candisplay an image (a display image) by illuminating a plurality of scanlines (odd-numbered lines and even-numbered lines). The display unit 220is capable of both image display according to the “interlacing method”and image display according to the “progressive method”, as describedabove.

The shutter button 224 is a button that is pressed by a user (a useroperation) in order to instruct to shoot of a static image (issue aninstruction to shoot a static image). The moving image shooting button230 is a button that is pressed by the user (a user operation) in orderto issue an instruction to shoot a moving image.

The operating unit 226 includes various operating members such asswitches and buttons for receiving various operations from the user. Forexample, the operating unit 226 includes a power supply switch forswitching a power supply of the digital camera 200 ON and OFF, a modeswitch for switching an operating mode of the digital camera 200, and amenu button for performing menu settings on the digital camera 200. Theoperating unit 226 also includes a 4-direction key button for issuingmenu and setting instructions on a screen displayed on the display unit220, and so on. The operation modes switched using the mode switchinclude a continuous imaging mode (a mode enabling continuous imaging,in which the user continuously shoots static images by fully pressingthe shutter button 224), for example. In the continuous imaging mode,the user can perform continuous imaging while varying the attitude ofthe digital camera 200 leftward, rightward, upward, and downward.

The external recording medium 229 is a recording medium (a storagemedium) such as a memory card or a hard disk. The lid 101 is a lid forhousing the external recording medium 229.

FIG. 2 is a view showing a configuration of the digital camera 200 shownin FIG. 1 . The digital camera 200 includes a barrier 201, an imaginglens 202, a shutter 203, an imaging element 204, an A/D converter 205, atiming generator 209, a D/A converter 210, an image processing unit 212,and a memory control unit 213. The digital camera 200 also includes asystem control unit 214, an exposure control unit 215, a distancemeasurement control unit 216, a memory 217, a layer synthesis unit 219,the display unit 220, a zoom control unit 221, a harder control unit222, a nonvolatile memory 223, and the operating unit 226, The digitalcamera 200 further includes a power supply 80, a card controller 227, apower supply control unit 228, and the moving image shooting button 230.

The barrier 201 is a protective unit that covers an imaging unitincluding the imaging lens 202. The barrier 201 prevents soiling andbreakage of the imaging unit. The imaging lens 202 is a lens unit onwhich a replaceable imaging lens is mounted. The shutter 203 is capableof freely controlling the exposure time of the imaging element 204 underthe control of the exposure control unit 215.

The imaging element 204 (image sensor) includes a CCD, a CMOS element,or the like for converting an optical image into an electric signal. Theimaging element 204 is capable of acquiring a static image to berecorded in the memory 217 and a display image, which is a video to bedisplayed on the display unit 220, The imaging element 204 outputs animage acquired by shooting an object as an analog signal.

The A/D converter 205 converts the analog signal (an image signal)output from the imaging element 204 into a digital signal (data; imagedata). The D/A converter 210 converts a digital signal (an image; imagedata) output from the memory control unit 213 into an analog signal.

The timing generator 209 is a circuit for supplying clock signals andcontrol signals to the imaging element 204, the A/D converter 205, andthe D/A converter 210. The timing generator 209 is controlled by thememory control unit 213 and the system control unit 214.

The image processing unit 212 performs various types of image processingand/or detection processing on an image (data) output from the A/Dconverter 205 or an image output from the memory control unit 213.Further, when the image processing unit 212 performs predeterminedcalculation processing using the image output from the imaging element204, the system control unit 214 controls the exposure control unit 215and the distance measurement control unit 216 on the basis of thecalculation result. Thus, AF (autofocus) processing, AF (automaticexposure) processing. EF (electronic flash pre-emission) processing,face detection processing, or individual authentication processing isperformed. Furthermore, the image processing unit 212 reads an imagestored in the memory 217, performs compression processing or expansionprocessing thereon using the JPEG method or the MPEG-4 AVC/H.264 method,and writes the processed image to the memory 217.

The memory control unit 213 controls the A/D converter 205. the timinggenerator 209, the image processing unit 212, the D/A converter 210, andthe memory 217. Accordingly, an image output from the A/D converter 205is written to the memory 217 via the image processing unit 212 and thememory control unit 213. Alternatively, the image output from the A/Dconverter 205 is written to the memory 217 directly via the memorycontrol unit 213.

The layer synthesis unit 219 superimposes a layer on an image outputfrom the memory 217. Here, the layer may be a display item indicatingthat the image is in a recorded state, a display item indicating a time,a display item representing a frame, or the like.

The display unit 220 displays the image on which the layer has beensynthesizes by the layer synthesis unit 219. By displaying images outputfrom the imaging element 204 successively using the display unit 220, itis possible to realize live video display (an electronic viewfinderfunction; live view).

The memory 217 stores captured static images and moving images (videos).The memory 217 has a sufficient storage capacity for storing apredetermined number of static images and moving images of apredetermined length. Further, the system control unit 214 can use thememory 217 as a working area.

The exposure control unit 215 controls the shutter 203. The distancemeasurement control unit 216 controls focusing by the imaging lens 202.The zoom control unit 221 controls zooming (enlargement/reduction) bythe imaging lens 202. The barrier control unit 222 controls theoperation of the barrier 201 serving as a protective unit.

The system control unit 214 includes a CPU or the like for controllingthe entire digital camera 200. The system control unit 214 can controlthe respective function units by executing a program recorded in thenonvolatile memory 223. The system control unit 214 is also capable ofreading the display image (the video) from the imaging element 204 inframe units.

An electrically erasable/recordable memory such as an EEPROM is used asthe nonvolatile memory 223. Alphabetic character information and so onare recorded in the nonvolatile memory 223 in addition to the program.

The operating unit 226 is constituted by operating members that are usedby the user to input various operating instructions into the systemcontrol unit 214. The operating unit 226 includes at least one of abutton, a touch panel, a gaze detection device (a device for detecting alocation at which the user is looking), a voice recognition device, andso on. Here, the button may be a power supply button, a menu button, amode switch, a 4-direction key, a set button, a macro button, a flashsetting button, a menu moving button, a playback image moving button, animage quality selection button, an exposure correction button, adate/time setting button, and so on. Note that the mode switch is aswitch for alternating between an imaging mode, a playback mode, andother special imaging modes, for example.

The shutter button 224 can be pressed in two stages, namely half-pressedand fully pressed. The shutter button 224 may therefore be said toinclude two operating members, namely an operating member for receivinghalf depression and an operating member for receiving full depression.When half-pressed by the user, the shutter button 224 generates ashutter signal SW1 and transmits the shutter signal SW1 to the systemcontrol unit 214. Upon receipt of the shutter signal SW1, the systemcontrol unit 214 starts an operation such as AF (autofocus) processing,AE (automatic exposure) processing, AWB (automatic white balance)processing, or EF (electronic flash pre-emission) processing.

Further, when fully pressed by the user, the shutter button 224generates a shutter signal SW2 and transmits the shutter signal SW2 tothe system control unit 214. Upon receipt of the shutter signal SW2, thesystem control unit 214 starts an operation (an imaging operation)constituted by a series of processes for subjecting the analog signalread from the imaging element 204 to exposure processing, developmentprocessing, and recording processing.

Here, the exposure processing is processing for reading the analogsignal from the imaging element 204 and writing the read analog signalto the memory 217 via the A/D converter 205 and the memory control unit213 as an image in a RAW data format or the like. Further, thedevelopment processing is processing for reading the image (image data)subjected to the exposure processing from the memory 217, performingexpansion processing to the JPEG method or the MPEG-4 AVC/H.264 methodthereon using the image processing unit 212, and then writing the imageback to the memory 217. Furthermore, the storage processing isprocessing for reading the image subjected to the development processingfrom the memory 217, performing compression processing thereon using theimage processing unit 212, and then writing the image to the memory 217or to the external recording medium 229 via the card controller 227.

The power supply 80 includes a primary battery (an alkali battery, alithium battery, or the like), a secondary battery (an NiCd battery,NiMH an battery, an Li battery, or the like), an adapter for connectingto an external power supply, or the like.

The card controller 227 exchanges images (data) with the externalrecording medium 229, which is constituted by a memory card or the like.

<Operation of Digital Camera During Continuous Imaging>: Next, anoperation of the digital camera 200 (the display control device) duringcontinuous imaging according to the first embodiment will be describedusing a flowchart shown in FIG. 3 and a timing chart shown in FIG. 4 .

FIG. 3 is a flowchart showing a flow of this embodiment in a case wherethe display method employed when continuously capturing static images isthe “interlacing method” and a display delay (the time interval betweenreading and display of the display image) is controlled so as to beconstant in each frame. The processing of the flowchart shown in FIG. 3is realized by having the system control unit 214 execute the programstored in the nonvolatile memory 223.

In S300, the system control unit 214 controls the imaging element 204 soas to read (acquire) the display image (a single frame of a video) at59.94 fps (at fixed time intervals; periodically). The display image isexpanded to the memory 217 by the memory control unit 213 via the A/Dconverter 205 and the image processing unit 212.

In S301, the system control unit 214 transfers the display imageexpanded to the memory 217 to the display unit 220 so as to display thedisplay image on the display unit 220. FIG. 4 is a timing chart showingtime relationships between the start of reading and the start of displayof the display image. When the reading start time of an n-th frame isset as Ex[n] and the display start time of the n-th frame is set asDisp[n], a display delay time Δdisp[n] constituting an interval betweenthe two times is Disp[n]−Ex[n]. Further, in this embodiment, reading anddisplay of the display image are driven at the same rate of 59.94 fps.In other words, the frame update rate in S301 is the same as the framerate at which the display images are shot. Accordingly,Ex[n]−Ex[n−1]=Disp[n] Disp[n−1]=16.7 msec. In S301, the display image isdisplayed at a display update rate of 59.94 fps and using the“progressive method” as the display method.

In S302, the system control unit 214 determines whether or not the userhas fully pressed the shutter button 224 (in other words, whether or notSW2 has been generated). When SW2 has been generated, the processingadvances to S303, and when SW2 has not been generated, the processingreturns to S300. Here, fully pressing the shutter button 224 is anoperation for issuing an instruction to continuously shoot staticimages.

In S303, the system control unit 214 determines the exposure time for acase in which a static image is to be shot. In this embodiment, as shownin FIG. 4 , the exposure time for a static image during continuousimaging is not a constant value and may be extended or reduced asdesired (in accordance with the brightness of the object) to anymultiple of 8.3 msec.

In S304, the system control unit 214 controls the exposure control unit215 to perform exposure processing for shooting a static image for theduration of the exposure time determined in S303. At this time, as shownin FIG. 4 , the reading start time of the display image prior to thegeneration of SW2 (immediately before SW2 is generated) is set as Ex[k],and the reading start time following exposure in S304 is set as Ex[k+1],in this embodiment, the system control unit 214 controls the exposurestart time of the static image so that Ex[k+1]−Ex[k]=500 msec. Here, thesystem control unit 214 controls the exposure start time of the staticimage so that regardless of the timing at which the user fully pressesthe shutter button 224, the time from full depression to reading of thestatic image remains constant. Note that the system control unit 214performs control (recording control) to record (read) the static imagecaptured as a result of the exposure processing in the memory 217.

In S305, as shown in FIG. 4 , the system control unit 214 shills thedisplay update timing of the display unit 220 by AA from the originaldisplay end timing of the previous frame (a timing 16.7 msec from thestart of display). Note that ΔA is (Ex[k+1]−Ex[k])% 16.7 msec (a timecorresponding to the remainder of dividing Ex[k+1]−Ex[k]=500 msec by16.7 msec).

In S306, the system control unit 214 changes the display mode during thecontinuous imaging. More specifically, the system control unit 214changes the display update rate to 119.88 fps and changes the displaymethod to the “interlacing method”. When the display method is changedto the “interlacing method”, the resolution decreases, but the powerconsumption required for image display can be suppressed. Hence, bychanging to the “interlacing method”, the digital camera 200 can securepower for recording the static image. In S306, even when the exposuretime for shooting the static image has been extended, the display delaytime (the time between reading and display of the display image) is keptconstant in each frame. In FIG. 4 , “T” represents display of thedisplay image using the odd-numbered lines, and “B” represents displayof the display image using the even-numbered lines.

By changing the display method after shifting the display update timingin this manner, the time between reading and display of the displayimage can be kept constant when the “interlacing method” is employed,and the display interval of the display image (the display time of asingle static image) can be fixed. Hence, even when shooting a movingobject, display can be performed so that the movement of the movingobject does not produce a feeling of discomfort in the user.

In S307, the system control unit 214 determines whether or not the userhas fully pressed the shutter button 224 (in other words, whether or notSW2 has been generated; whether or not full depression has beenreleased). When SW2 is generated, the processing advances to S308, andwhen SW2 is not generated, the processing advances to S320. Here, therelease of full depression of the shutter button 224 is an operation forcanceling continuous imaging of static images.

In S308, the system control unit 214 controls the imaging element 204 soas to read the display image at 118.94 fps. The display image isexpanded to the memory 217 by the memory control unit 213 via the A/Dconverter 205 and the image processing unit 212.

In S309, the system control unit 214 transfers the display imageexpanded to the memory 217 to the display unit 220 so as to display thedisplay image on the display unit 220.

In S310, the system control unit 214 determines the exposure time forshooting a static image. As described above, the exposure time can beextended or reduced in multiples of 8.3 msec.

In S311, the system control unit 214 controls the exposure control unit215 to perform exposure for the exposure time determined in S310.

In S320, the system control unit 214 returns the display mode at atiming at which display of the display image on the even-numbered linesends. In other words, the system control unit 214 returns (changes) thedisplay update rate to 59.94 fps, and returns the display method to the“progressive method”.

In S321, the system control unit 214 shifts the display update timing byΔB in order to align the subsequent display delay time with the displaydelay time Δdisp[n] prior to the start of the continuous imaging. As aresult, the display delay time is kept constant even after the end ofthe continuous imaging.

By shifting (changing) the display update timing after returning thedisplay method to the “progressive method” in S320 in the mannerdescribed above, the display interval established in the “interlacingmethod” is fixed, and therefore the display time of the odd-numbered oreven-numbered lines does not lengthen. As a result, the continuousimaging processing can be completed without causing flickering to occurwhen the display image is displayed as a moving image.

[Second Embodiment]: In the digital camera 200 to be described in asecond embodiment, during continuous imaging, the display update rate ischanged to 239.76 fps and the display method is changed to the“interlacing method”. An operation performed by the digital camera 200during continuous imaging will be described below using FIG. 6 . Note.that the processing performed in S301 to S305 and S307 to S311 issimilar to the processing of the first embodiment, shown on theflowchart in FIG. 3 , and therefore description thereof has beenomitted.

In the second embodiment, when the processing of S305 is complete, theprocessing advances to S506. Further, in S307, the processing advancesto S308 when SW2 is generated and advances to S521 when SW2 is notgenerated.

In S506, as shown in FIG. 5 , the system control unit 214 changes thedisplay update rate to 239.76 fps and changes the display method to the“interlacing method” during the continuous imaging.

In S521, as shown in FIG. 5 , the system control unit 214 shifts thedisplay update timing by ΔC in order to align the subsequent displaydelay time with the display delay time Δdisp[n] prior to the start ofthe continuous imaging. At this time, the system control unit 214determines whether or not the sum of ΔC and 4.15 msec (the display timeof a single frame at 239.76 fps) exceeds 8.3 msec (a time correspondingto 119.88 fps). Here, when the sum of ΔC and 4.15 msec exceeds 8.3 msec,the system control unit 214 shifts the display update timing by 4.15msec of ΔC. The system control unit 214 then shifts the display updatetiming by the excess (the remainder) when displaying the next displayimage at 239.76 fps.

In S522, at the timing at which display of the display image on theeven-numbered lines ends. the system control unit 214 returns thedisplay update rate to 59.94 fps and returns the display method to the“progressive method”.

Hence, when the display update rate is 239.76 fps, the display method isreturned to the “progressive method” after shifting the display updatetiming. Note that in this embodiment, the display update rate is 239.76fps, but the display method may also be returned to the “progressivemethod” after shifting the display update timing in a case where thedisplay update rare equals or exceeds 239.76 fps (equals or exceeds apredetermined value), According to this embodiment, the display updatetiming is adjusted so as to be extended only to a maximum of 8.3 msec,and therefore the possibility of flickering being visible to the user isreduced. Moreover, by shifting the display update timing in advance, thefrequency with which the detection image is stopped following thecontinuous imaging can be reduced.

Note that in the embodiments described above, when a video is displayedusing the “interlacing method”, data. of the odd-numbered rows of asingle frame of the video are displayed on the odd-numbered lines,whereupon data of the even-numbered rows of the single frame aredisplayed on the even-numbered lines. Here, instead of the “interlacingmethod”, any other desired display method with which the verticalresolution is lower than that of the “progressive method” may be used.For example, a “doubler method” or a “Mars method” may be used insteadof the “interlacing method”. In the “doubler method”, when the data ofthe odd-numbered rows are displayed, the data are displayed not only onthe odd-numbered lines but also on the even-numbered lines immediatelytherebelow, and when the data of the even-numbered rows are displayed,the data are displayed not only on the even-numbered lines but also onthe odd-numbered lines immediately thereabove. In the “Mars method”,when the data of the odd-numbered rows are displayed, the data aredisplayed not only on the odd-numbered lines but also on the even-numbedlines immediately thereabove, and when the data of the even-numberedrows are displayed, the data are displayed not only on the even-numberedlines but also on the odd-numbered lines immediately thereabove. In the“Mars method”, when the data of the odd-numbered rows are displayed, thedata. may be displayed not only on the odd-numbered lines but also onthe even-numbered lines immediately therebelow, and when the data of theeven-numbered rows are displayed, the data may be displayed not only onthe even-numbered lines but also on the odd-numbered lines immediatelytherebelow.

Hence, with all of the “interlacing method”, the “doubler method”, andthe “Mars method”, display using only the data of the odd-numbered rowsis performed on odd-numbered frames, and display using only the data ofthe even-numbered rows is performed on even-numbered frames. In otherwords, a video is displayed by switching between display using only thedata. of the odd-numbered rows of one frame of the video and displayusing only the data of the even-numbered rows of one frame of the video.

According to the present invention, a user can perform image capture asintended, without feeling discomfort.

<Other Embodiments>: Embodiment(s) of the present invention can also berealized by a computer of a system or apparatus that reads out andexecutes computer executable instructions (e.g., one or more programs)recorded on a storage medium (which may also be referred to more fullyas a ‘non-transitory computer-readable storage medium’) to perform thefunctions of one or more of the above-described embodiment(s) and/orthat includes one or more circuits (e.g., application specificintegrated circuit (ASIC)) for performing the functions of one or moreof the above-described embodiment(s), and by a method performed by thecomputer of the system or apparatus by, for example, reading out andexecuting the computer executable instructions from the storage mediumto perform the functions of one or more of the above-describedembodiments) and/or controlling the one or more circuits to perform thefunctions of one or more of the above-described embodiment(s). Thecomputer may comprise one or more processors (e.g., central processingunit (CPU), micro processing unit (MPU)) and may include a network ofseparate computers or separate processors to read out and execute thecomputer executable instructions. The computer executable instructionsmay be provided to the computer, for example, from a network or thestorage medium. The storage medium may include, for example, one or moreof a hard disk, a random-access memory (RAM), a read only memory (ROM),a storage of distributed computing systems, an optical disk (such as acompact disc (CD), digital versatile disc (DVD), or Blu-ray Disc (BD)™),a flash memory device, a memory card, and the like.

While the present invention has been described with reference toexemplary embodiments, it is to be understood that the invention is notlimited to the disclosed exemplary embodiments. The scope of thefollowing claims is to be accorded the broadest interpretation so as toencompass all such modifications and equivalent structures andfunctions.

This application claims the benefit of Japanese Patent Application No.2021-014917, filed on Feb. 2, 2021, which is hereby incorporated byreference herein in its entirety.

What is claimed is:
 1. A display control device for controlling adisplay panel that is switchable between a first display mode in which avideo is displayed at a first vertical resolution and a second displaymode in which a video is displayed at a second vertical resolution thatis lower than the first vertical resolution, the display control devicecomprising at least one memory and at least one processor which functionas: a control unit configured, in a first case where a first operationis received in the first display mode, to change to the second displaymode after changing a display update timing in the first display mode,and in a second case where a second operation is received in the seconddisplay mode, to change the display update timing after changing to thefirst display mode, wherein in the first display mode, the display paneldisplays the video using a progressive method, and in the second displaymode, the display panel displays the video by switching between a firstdisplay using a part of data in one frame of the video and a seconddisplay using a part of the data.
 2. The display control deviceaccording to claim 1, wherein a display update rate in the seconddisplay mode is higher than a display update rate in the first displaymode.
 3. The display control device according to claim 1, wherein adisplay update rate in the first display mode is equal to a frame rateat which the video is captured.
 4. The display control device accordingto claim 1, wherein, in the second case, in a case where a displayupdate rate of the second display mode equals or exceeds a predeterminedvalue, the control unit changes the display update timing in the seconddisplay mode and then changes to the first display mode.
 5. The displaycontrol device according to claim 1, wherein the at least one memory andthe at least one processor further function as a recording control unitconfigured to record in a storage a plurality of static images capturedcontinuously in the second display mode.
 6. The display control deviceaccording to claim 1, further comprising an image sensor configured toacquire the video of an object, wherein the control unit reads the videofrom the image sensor for each frame.
 7. The display control deviceaccording to claim 1, wherein, in the first case, the control unitchanges the display update timing so that a display time of each frameof the video in the second display mode is constant.
 8. The displaycontrol device according to claim 1, wherein the first operation isdepression of a predetermined operating member, and the second operationis release of the depression of the predetermined operating member. 9.The display control device according to claim 1, wherein the firstoperation is an operation for instructing continuous shooting of staticimages, and the second operation is an operation for cancelingcontinuous shooting of static images.
 10. The display control deviceaccording to claim 1, wherein the first display and the second displayare different from each other.
 11. The display control device accordingto claim 1, wherein the first display is a display using data of oddnumbered rows of one frame of the video, for odd lines of the displaypanel as well as even lines of the display panel, or a display usingdata of even numbered rows of one frame of the video, for even lines ofthe display panel as well as odd lines of the display panel.
 12. Thedisplay control device according to claim 1, wherein in the seconddisplay mode, the display panel displays the video using one of aninterlacing method, a doubler method and a Mars method.
 13. A displaycontrol device for controlling a display panel that is switchablebetween a first display mode in which a video is displayed at a firstvertical resolution and a second display mode in which a video isdisplayed at a second vertical resolution that is lower than the firstvertical resolution, the display control device comprising at least onememory and at least one processor which function as: a control unitconfigured, in a first case where a first operation is received in thefirst display mode, to change to the second display mode after changinga display update timing in the first display mode, and in a second casewhere a second operation is received in the second display mode, tochange the display update timing after changing to the first displaymode, wherein, the display control device further comprises an imagesensor configured to acquire the video of an object, the control unitreads the video from the image sensor for each frame, and in the firstcase or the second case, the control unit changes the display updatetiming so that a time between reading of each frame of the video fromthe image sensor and displaying thereof on the display panel isconstant.
 14. A display control method for controlling a display panelthat is switchable between a first display mode in which a video isdisplayed at a first vertical resolution and a second display mode inwhich a video is displayed at a second vertical resolution that is lowerthan the first vertical resolution, the display control methodcomprising: a step for changing to the second display mode afterchanging a display update timing in the first display mode in a firstcase where a first operation is received in the first display mode; anda step for changing the display update timing after changing to thefirst display mode in a second case where a second operation is receivedin the second display mode, wherein in the first display mode, thedisplay panel displays the video using a progressive method, and in thesecond display mode, the display panel displays the video by switchingbetween a first display using a part of data in one frame of the videoand a second display using a part of the data.
 15. A non-transitorycomputer readable medium that stores a program, wherein the programcauses a computer to execute a display control method, the displaycontrol method being a display control method for controlling a displaypanel that is switchable between a first display mode in which a videois displayed at a first vertical resolution and a second display mode inwhich a video is displayed at a second vertical resolution that is lowerthan the first vertical resolution, the display control methodcomprising: a step for changing to the second display mode afterchanging a display update timing in the first display mode in a firstcase where a first operation is received in the first display mode; anda step for changing the display update timing after changing to thefirst display mode in a second case where a second operation is receivedin the second display mode, wherein in the first display mode, thedisplay panel displays the video using a progressive method, and in thesecond display mode, the display panel displays the video by switchingbetween a first display using a part of data in one frame of the videoand a second display using a part of the data.
 16. The display controldevice according to claim 11, wherein in the second display mode, thedisplay panel displays the video using a Mars method.